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The list size value includes list type and data size but not the LIST FOURCC or the list size component. The list type component is another FOURCC, and the list data component includes lists or chunks in no particular order. LIST is a FOURCC, while the 4-byte list size component specifies the list’s size. The chunk size component defines the size of the chunk’s valid data, not including the padding or the ID and size components. The data should always be padded to the closest WORD boundary. The chunk data (ckData) may contain zero bytes or more data. The ckID component is a FOURCC identifying the data included in a chunk, while the ckSize component is a 4-byte value specifying the size of the chunk data. The data includes the lists and data chunks contained in the file in no particular order. The file size value includes the size of the file type FOURCC and the data following, but not the initial RIFF FOURCC or the size of the file size component. In this context, RIFF refers to a FOURCC, the file size refers to a 4-byte value specifying the size of the file’s data, and the file type refers to another FOURCC identifying the type of file. RIFF files consist of a header and (optionally) lists and data chunks. The structure of the AVI file format builds on the RIFF format used for documents. The AVI format identifies details such as the type of stream, data chunk, and index entry using FOURCCs. A FOURCC may include spaces as characters, so a code with three letters and a space is valid. There is also a simple AVI sequence variation that only uses video data, without not an audio stream.Ī four-character code (FOURCC) is an unsigned 32-bit integer made using four American Standard Code for Information Interchange (ASCII) characters. AVI sequences usually include a video stream and an audio stream. AVI files generally contain multiple data streams with various types of data. The AVI format is a Resource Interchange File Format (RIFF) specification for applications that record, play, and edit video and audio sequences. How Do You Convert AVI to MP4 Or WebM Format With Cloudinary?.We’ll cover the basic structure of the AVI format, discuss it’s pros and cons, and show how it compares to modern file formats like MP4. Microsoft supports these files, which are sometimes (unofficially) known as AVI 20. An AVI file can store video and audio data in a container allowing synchronous video-with-audio playback.ĪVI files often use the format extensions that Matrox OpenDML introduced in 1996. The Audio Video Interleave format, or AVI, is a multimedia container video format that Microsoft first released in 1992.